Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (230)	$ 15,777
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net tax of $0	(53,639)	(12,046)
Interest rate hedge adjustments, net of tax (benefit) expense of $0 and ($112), respectively	0	550
Defined benefit pension plans, net of tax expense of $1,060 and $771, respectively	2,763	1,454
Total other comprehensive income (loss), net of tax	(50,876)	(10,042)
Comprehensive income (loss)	$ (51,106)	$ 5,735